Really liking the new design, overall.
As most others have said, the top header with the welcome text is a bit too prominent while browsing the directory/forums. It's a bit too in your face Perhaps you could set it so that the header is only visible when users are not logged in - this may also encourage new users to sign up, and returning users to sign in.
The welcome text could also use a rewrite. If you do decide to hide it for logged in users, it might be good to add something like "Join us! It's free and you get cookies." (It's technically true!)
I really like JOCo's suggestion of moving login/logout/etc to the top. The light grey top bar in the forums (that says Index, User list, Rules etc.) would probably look good on the rest of the site as well, consolidating and simplifying the overall look of the site. It'd be a great replacement for the green Controls box which looks really dated compared to the new header.
Last of all, I like the new colour scheme you chose for the forums and I hope in time it will be implemented across the web site. Some of the CSS on the forums still needs an update, though - links are still in the old colour scheme (blue for the Filmmaking section, green in Community, and orange in Website).
Anyway, those are my two cents.
EDIT: Also, you fixed the "wait a minute after submitting your post for the page to load even though your post is already visible" bug! Hurrah!